#include <stdio.h>
// #define NDEBUG
#include <assert.h>
#include <string.h>


#define TRUE    1
#define FALSE   0
#define MAXLEN  1000

typedef short bool;

typedef struct {
    char data[MAXLEN];
    int index;
}Stack;

void stack_push(Stack *stack){

}

bool isValid(char * s){
    Stack stack;
    memset(&stack,0, sizeof(Stack));
}

int main(int argc, char* argv[]){
    Stack stack;
    memset(&stack,0, sizeof(Stack));

    return 0;
}